Quantum mechanics is the fundamental theory describing nature at the smallest scales. Developed in the 1920s by Heisenberg, Schrödinger, Dirac, and Born, it replaced classical physics with a framework where particles behave as waves, measurements disturb what they measure, and 'spooky action at a distance' connects particles across space.
The theory is spectacularly successful — it underpins all of modern chemistry, semiconductor physics, lasers, MRI scanners, and quantum computing. Yet its interpretation remains deeply controversial. Does the wave function collapse upon observation? Do many worlds branch at every measurement? After a century, physicists still disagree.
These simulations let you explore the core phenomena of quantum mechanics: tunnel through barriers that classical physics forbids, watch interference patterns emerge one photon at a time, manipulate qubits on the Bloch sphere, and see how entangled particles violate Bell's inequality.